Compression Test Question 1981 GL1100i


Information and questions on GL1100 Goldwings (1980-1983)
  • Sponsored Links
MotorPsycho
Posts: 8
Joined: Tue Oct 08, 2013 11:51 am
Location: Andover, MN
Motorcycle: 1981 GL1100 Interstate

Compression Test Question 1981 GL1100i

Postby MotorPsycho » Thu Oct 10, 2013 9:57 pm



I just got this bike and the odometer says 60K miles (no idea if that is accurate or not).
I ran a compression test on all 4 cylinders - 120 psi (+/- 2 psi for all cylinders (I think it is supposed to be around 170 psi)
A squirt of oil increased the compression by 15 psi on all cylinders.
If the air filter is plugged (I haven't looked at it) would that not influence the compression? Sort of like not holding
the throttle wide open when running the test?[b]
[/b]
For what it is worth, it runs hot (like a tooth-pick width away from the red (and the coolant is clean, new and non silica).
If it requires an overhaul, are parts available for it? Can the cylinder be bored or is it sleeved? Are after market high
performance pistons or anything available for these?
I know this is a lot of questions and I thank you for your input -
MotorPsycho



User avatar
moffat
Posts: 264
Joined: Thu Aug 05, 2010 2:30 pm
Location: Northwich United Kingdom
Motorcycle: 1982 GL1100
Interstate

Re: Compression Test Question 1981 GL1100i

Postby moffat » Fri Oct 11, 2013 5:27 am

If I where you I would use it for a while before any major overhaul. Does it smoke a lot apart from the usual Goldwing slight smoke on start up after a rest. If its not excessive smoke I would leave well alone as these engines are amazingly tough.
The cylinder sleeves are cast into the engine casings and can be re-bored. I had the left hand bank re-sleeved to standard bore by a very experienced machine shop man who specialises in racing engines as the bores where badly corroded due to water lying in the for tears by a previous owner.
The compression test figures as per the book are sea level cos if you live at high altitude the figures will be less. Take the air filter off and test again just to be sure. Throttle wide open and kill switch off. By adding the oil and the compression figures increase show ring wear but how much???

User avatar
RBGERSON
Posts: 2625
Joined: Tue Mar 09, 2010 7:57 am
Location: SCOTTSDALE, AZ
Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: Compression Test Question 1981 GL1100i

Postby RBGERSON » Fri Oct 11, 2013 8:09 am

120 is way low..but if the bike has been sitting run it for 500 miles and test again the rings could be stuck a bit. Yes throttle wide open, adding oil and numbers up = ring issues..but check the valve settings just in case too. Cheaper to buy another engine than rebuild..They can be found for around $200 or less with good compression.
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

MotorPsycho
Posts: 8
Joined: Tue Oct 08, 2013 11:51 am
Location: Andover, MN
Motorcycle: 1981 GL1100 Interstate

Re: Compression Test Question 1981 GL1100i

Postby MotorPsycho » Fri Oct 11, 2013 12:13 pm

Thanks for the tips, RBGERSON and moffat!
I will pull the air cleaner and report back.
A 500 mile second chance makes sense as well.
Checking the valves is also good thinking.
MotorPsycho

User avatar
littlebeaver
Posts: 4420
Joined: Mon Sep 21, 2009 6:11 pm
Location: Kansas City, Kansas
Motorcycle: 1981 gl 1100 I , 79 Yamaha XS11
Special, 82 Kawa 750 CSR, 82 Kawa 750 LTD, 03 Kawa Nomad 1500, 99 Kawa Voyager 1200

Re: Compression Test Question 1981 GL1100i

Postby littlebeaver » Fri Oct 11, 2013 7:58 pm

You said it is running hot, is the fan not kicking on because the needle should never get up that high to the red zone,,,shouldn't get passed about 3/4 the way up on the gauge..the fan comes on and brings the temp back down then it cycles back off...automaticly...Sure sounds like the fan is not kicking on.. Bad fan switch, new one should fix this problem..

MotorPsycho
Posts: 8
Joined: Tue Oct 08, 2013 11:51 am
Location: Andover, MN
Motorcycle: 1981 GL1100 Interstate

Re: Compression Test Question 1981 GL1100i

Postby MotorPsycho » Fri Oct 11, 2013 10:35 pm

Thanks littlebeaver for the follow up on the "running hot" comment I made!
The previous owner said the temp switch for the fan failed so he mounted a on/off toggle switch on the panel.
The fan does turn on when the switch is on . . . but it doesn't seem to help. I don't know, maybe the fan is spinning the wrong way? I'm guessing the water pump might be bad? No coolant leaks from the weep hole - no indication of coolant in the oil either. Plugged up radiator? I'm thinking the water pump might not be working?
Too much "thinking" and not enough "doing" that's sorta where I'm at right now. Any clever ways of determining if the water pump is actually circulating like it should? I wonder if I could bypass the radiator using a clear hose or something to actually see it circulate? Like I said, too much thinking and not enough doing.
Thanks again littlebeaver - I appreciate your input!
MotorPsycho

User avatar
littlebeaver
Posts: 4420
Joined: Mon Sep 21, 2009 6:11 pm
Location: Kansas City, Kansas
Motorcycle: 1981 gl 1100 I , 79 Yamaha XS11
Special, 82 Kawa 750 CSR, 82 Kawa 750 LTD, 03 Kawa Nomad 1500, 99 Kawa Voyager 1200

Re: Compression Test Question 1981 GL1100i

Postby littlebeaver » Sat Oct 12, 2013 1:47 am

MotorPsycho wrote:Thanks littlebeaver for the follow up on the "running hot" comment I made!
The previous owner said the temp switch for the fan failed so he mounted a on/off toggle switch on the panel.
The fan does turn on when the switch is on . . . but it doesn't seem to help. I don't know, maybe the fan is spinning the wrong way? I'm guessing the water pump might be bad? No coolant leaks from the weep hole - no indication of coolant in the oil either. Plugged up radiator? I'm thinking the water pump might not be working?
Too much "thinking" and not enough "doing" that's sorta where I'm at right now. Any clever ways of determining if the water pump is actually circulating like it should? I wonder if I could bypass the radiator using a clear hose or something to actually see it circulate? Like I said, too much thinking and not enough doing.
Thanks again littlebeaver - I appreciate your input!
MotorPsycho

Could be a few things...maybe a stuck thermostat maybe a clog, maybe the pump, you may be able to tell if it's circulating with the cap off, maybe you can see it, I have not tried this on mine...

User avatar
RBGERSON
Posts: 2625
Joined: Tue Mar 09, 2010 7:57 am
Location: SCOTTSDALE, AZ
Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: Compression Test Question 1981 GL1100i

Postby RBGERSON » Sat Oct 12, 2013 8:46 am

Thermostat not opening is my first guess on the too hot..

when you are running at 30 + mph the fan is not that big an issue running or not

..if you pull the elbow off the water pump cover..easy to do pan to catch the water..then you can see the impeller..if you can wiggle it, it's going out..but if you have no water or oil dripping out of the weep hole on the pump housing it's not to bad yet and probably not the source of your over heating.
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

User avatar
moffat
Posts: 264
Joined: Thu Aug 05, 2010 2:30 pm
Location: Northwich United Kingdom
Motorcycle: 1982 GL1100
Interstate

Re: Compression Test Question 1981 GL1100i

Postby moffat » Sat Oct 12, 2013 9:32 am

Small point. The weep hole on my bike had been plugged up by a previous owner so I replaced the shoddy plastic impellored pump with one with a steel impellor. When the mechanical seal goes west then the weep hole allows water to escape letting you know there is a problem. Good idea to check the pump impellor.

MotorPsycho
Posts: 8
Joined: Tue Oct 08, 2013 11:51 am
Location: Andover, MN
Motorcycle: 1981 GL1100 Interstate

Re: Compression Test Question 1981 GL1100i

Postby MotorPsycho » Mon Oct 14, 2013 7:49 pm

Thank you moffat - pulling the elbow off the water pump is a great idea! I think I will do that first.
I don't have a lot of time for working on it, so everything takes me a lot more time to accomplish.
Thanks again for sharing your knowledge!

User avatar
moffat
Posts: 264
Joined: Thu Aug 05, 2010 2:30 pm
Location: Northwich United Kingdom
Motorcycle: 1982 GL1100
Interstate

Re: Compression Test Question 1981 GL1100i

Postby moffat » Tue Oct 15, 2013 5:46 am

If the impellor is damaged which if the brittle plastic one probably is check the pump shaft for up and down movement. What tends to happen is the bearing on the water pump wears out then the impellor bags on the side of the casing causing bits to break off. Then the mechanical seal give up the ghost and water can get into the oil or vice versa. A new pump with a steel impellor is best. To replace the water pump you will have to removes the front bottom casing as you cannot get at the water pump mounting bolts any other way-New gasket and O rings please!

MotorPsycho
Posts: 8
Joined: Tue Oct 08, 2013 11:51 am
Location: Andover, MN
Motorcycle: 1981 GL1100 Interstate

Compression Test Question 1981 GL1100i

Postby MotorPsycho » Wed Oct 16, 2013 12:25 pm

Due to the over-heating problem, I pulled the cover off the water pump so I could inspect the impeller. Everything looked nice and clean inside. The coolant had no oil in it. The impeller had the metal blades and no play noted in the bearing. Does the water pump run off a belt? I don't know where the thermostat is located, I thought it might be under the covers I removed to expose the impeller but not so. Is it missing, or does it reside somewhere else? I ran a plastic wire into the water ports from the water pump access and nothing seemed plugged. I suppose the radiator would be next? I did not see any steam in my exhaust when riding or idling. Any suggestions or comments are welcomed! Thanks for all the help.
MotorPsycho

User avatar
moffat
Posts: 264
Joined: Thu Aug 05, 2010 2:30 pm
Location: Northwich United Kingdom
Motorcycle: 1982 GL1100
Interstate

Re: Compression Test Question 1981 GL1100i

Postby moffat » Wed Oct 16, 2013 3:19 pm

I strongly recommend that you dowload the maintenance manual from this site and study it.

User avatar
littlebeaver
Posts: 4420
Joined: Mon Sep 21, 2009 6:11 pm
Location: Kansas City, Kansas
Motorcycle: 1981 gl 1100 I , 79 Yamaha XS11
Special, 82 Kawa 750 CSR, 82 Kawa 750 LTD, 03 Kawa Nomad 1500, 99 Kawa Voyager 1200

Re: Compression Test Question 1981 GL1100i

Postby littlebeaver » Wed Oct 16, 2013 6:03 pm

there is a place where the fan switch is located right above the front part of the engine, the thermostat lives under that elbow piece where the fan switch is, I'm pretty certain..
there it is #1 in this photo
there it is #1 in this photo
# 11 is your fan switch now 9# is your thermostat that goes to your gauges to tell you the temp. of the engines coolant.

MotorPsycho
Posts: 8
Joined: Tue Oct 08, 2013 11:51 am
Location: Andover, MN
Motorcycle: 1981 GL1100 Interstate

Re: Compression Test Question 1981 GL1100i

Postby MotorPsycho » Thu Oct 17, 2013 8:29 am

Thank you littlebeaver.

I thought that is where it should be, but it was missing and I didn't want to "assume". I imagine it was removed due to the over-heating problem.

Now I wonder if the coolant would circulate properly without the thermostat in place(?) I guess the radiator would be the next thing to investigate?

I've tried several times to download the shop manual for the bike but it never seems to work for me. I've had good luck downloading the various DIY articles though.

Well, I thank you again for helping littlebeaver, thank you!

MotorPsycho

User avatar
Joecop
Posts: 87
Joined: Sat Mar 17, 2012 5:28 pm
Location: Michigan
Motorcycle: 1980 GL1100I
1972 Honda Chopper
1989 Yamaha FZR600
1981 Honda ATC 200cc

Re: Compression Test Question 1981 GL1100i

Postby Joecop » Thu Oct 17, 2013 9:40 pm

One last thing make sure you use silicate free antifreeze. If not it will trash those o rings in the water pump.

User avatar
RBGERSON
Posts: 2625
Joined: Tue Mar 09, 2010 7:57 am
Location: SCOTTSDALE, AZ
Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: Compression Test Question 1981 GL1100i

Postby RBGERSON » Fri Oct 18, 2013 7:53 am

The pump runs off the oil sump/pump shaft the end of the water pump shaft is slotted and fits on the end of the oil pump shaft.
Attachments
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

User avatar
Johnyy Smoke
Posts: 600
Joined: Sat Nov 26, 2011 6:44 am
Location: Se Minnesota
Motorcycle: 1980 GL1100
Vetter. "Its like Deja Vu all over again".

Re: Compression Test Question 1981 GL1100i

Postby Johnyy Smoke » Sun Oct 20, 2013 7:18 am

Have you checked the timing? Sometimes this can cause an heating issue.
If all the cylinders reading are 120 +\- a couple of pounds it shouldn't be a concern if they are that close.
Regards, Johnyy

MotorPsycho
Posts: 8
Joined: Tue Oct 08, 2013 11:51 am
Location: Andover, MN
Motorcycle: 1981 GL1100 Interstate

Re: Compression Test Question 1981 GL1100i

Postby MotorPsycho » Mon Oct 21, 2013 9:00 am

Thanks for the timing tip Johnyy Smoke - I know I said in an earlier post that the thermostat was missing . . . that's because I'm a moron - I saw the casting on the front of the water pump and thought it looked like it should house a thermostat. I'm chasing these things down one by one and the timing is now on my list. Thank you.
Yesterday I pulled the thermostat (180 degree) and tested it in 190+ deg. water - it did not want to open without a tap or two - I tried it several times and it was repeatable, if I'm lucky that will be the root of the problem. I'll check the timing and timing belts etc, as long as I'm already in there. I'm from Minnesota so I have all winter to work on it. I've been impressed so far by the cleanliness of the water jackets I've seen - very nice. I still need to take a look at the valves too. Is there such a thing as buying a "set" of gaskets and O-rings for this old bird? It would be nice to have them on hand.
By the way, I did download the great pictures and instructions from GoldwingDocs.com - (it was a strong suggestion to "study it carefully" from a wise, knowledgeable man on this very chain of posts who recognized my newbiness and dependence on others). I thank him for that. I'm soon to be 63 years old and enjoy learning and tinkering on such things.
Again, Thank you JohnyySmoke (as in, Johny, "why smoke"?)
MotorPsycho

User avatar
Johnyy Smoke
Posts: 600
Joined: Sat Nov 26, 2011 6:44 am
Location: Se Minnesota
Motorcycle: 1980 GL1100
Vetter. "Its like Deja Vu all over again".

Re: Compression Test Question 1981 GL1100i

Postby Johnyy Smoke » Mon Oct 21, 2013 4:31 pm

I used the "Athena" top end gasket set when I redid the head gaskets, which I bought from bikebandit.com. Around $90 or there abouts.
It also includes valve seals. I would replace the cam oil seals while your in there, these are not included in the set. Also have a tube of gasket sealer around-really helps on the oil seals. Regards, Johnyy

MotorPsycho
Posts: 8
Joined: Tue Oct 08, 2013 11:51 am
Location: Andover, MN
Motorcycle: 1981 GL1100 Interstate

Re: Compression Test Question 1981 GL1100i

Postby MotorPsycho » Tue Oct 22, 2013 8:15 am

Thanks again Johnyy!
I will order the parts from bike-bandit!
MotorPsycho

mz250ts-1
Posts: 10
Joined: Fri Oct 25, 2013 10:22 pm
Location: guelph on
Motorcycle: 1982 GL 1100A Aspencade

Re: Compression Test Question 1981 GL1100i

Postby mz250ts-1 » Sun Dec 15, 2013 7:38 pm

Hi ,I have had a same problem .
Please check if rubber hose!(tube)inside the overflow tank is in a good shape mining there are no blockages
or even worse loosely attached to the thanks cap as it was case with my bike.
You should make shore that radiator is full with cooling solution and hose connecting radiator and over flow
tank cap is OK and well secured!!!
Once I have fixed all above mentioned problems temperature returned to normal!

Good luck and happy holidays

Zoran

User avatar
WINGER3
Posts: 202
Joined: Fri Oct 05, 2012 11:41 pm
Location: Orange, California
Motorcycle: current 2005 GL1800ABS previous GL1200A GL1500K GL1100A CB350 GL650I VFR1000 ST1100 GL1200A GL1500I + many other brands

Re: Compression Test Question 1981 GL1100i

Postby WINGER3 » Thu Dec 26, 2013 4:24 pm

Since I'm comming to this thread late, the cooling problem might have been solved, If not, here is my reason for the problem. Since you found no thermostate in the front of the water pump housing, that is a over heating problem, there should have been a 195F degree thermostate in there. When there is no thermostate the coolent is free flowing and never has a chance to stay in the radiator long enough to cool down, so it will continue to get hotter. When you have A THERMOSTATE IN PLACE IT HOLDS THE WATER INTO THE RADIATOR UNTILL THE ENG. REACHS AT LEAST 175F AND THEN SLOWLY STARTS TO OPEN, IT WILL BE FULLY OPEN BY 194F AND THEN WILL START TO CLOSE AT ABOUT 170F BY THE COOLER WATER FROM THE RADIATOR, THIS WILL THEN MAINTAIN THE NORMAL OPERATING TEMP. RANGE OF THE ENG. when installing a new thermostate make sure that the copper looking plug end with the TEMPERATURE STAMPED IN IT, IS FACEING THE WATER PUMP AND USE A NEW "O" RING. To be safe on getting the right thermostate, I would get it from Honda, for the few $ more for the OEM unit is worth it. If you have no Honda dealer there, then I would trust The Bike Bandit for the right one and get the "O" ring also. Hope this helps. :mrgreen:
DON'T DESTROY IT-RESTORE IT

westgl
Posts: 20
Joined: Sun Dec 26, 2010 10:17 pm
Location: Rogue river, Oregon
Motorcycle: "83' GL1100" "1984 GL1200A""1986 GL1200I" "88' GL1500" "1999 GL1500SE" "12' NC700X" "M109R" "all above are my current Bikes"

Re: Compression Test Question 1981 GL1100i

Postby westgl » Sun Jan 19, 2014 9:51 pm

Do you still have a over heating problem?

At the time when the engine shows that it is over heating, Is your gas gauge also, showing a very different fuel amount?

If so then the 7volt regulator has gone south, and showing hot.

I replaced my engine temp switch with the Geo metro switch, still ran hot on the gauge, fan was not coming on.

I replaced my 7volt regulator and found out my engine was running cool.




Return to “GL1100 Information & Questions”




Who is online

Users browsing this forum: Yahoo Slurp [Bot] and 8 guests